Bret R. Haymore, M.D. attended Penn State College of Medicine where he was elected to the AOA honor society.

Claire E. Atkinson Dr. Claire E. Atkinson is board certified in Pediatrics and board certified in Allergy & Immunology.

Dr. Atkinson joined the Oklahoma Allergy and Asthma Clinic staff in 1993.  He received his medical degree from the University of Oklahoma College of Medicine.

Elisa Thompson received her first bachelor’s degree from Austin College in Sherman, Texas, with a concentration in biology and psychology.

Greg Metz joined the Oklahoma Allergy & Asthma Clinic in 2011 and is a board-certified allergist.

Karen Gregory is a Doctor of Nursing Practice, Acute Care Clinical Nurse Specialist, Board Certified, with a specialty in asthma, allergy and pulmonary medicine.

Dr. Chong joined the Oklahoma Allergy & Asthma Clinic staff in 2012. She received her medical degree from the University of Illinois at Chicago College of Medicine.

Matthew Farley, MD, joined the team of allergy and asthma specialists at the Oklahoma Allergy and Asthma Clinic team in 2025.

Dr. Maya N. Gharfeh was raised in Columbus, Ohio and graduated from The Ohio State University in 2006 with her bachelor’s degree in Biology.

Meredith has been a Physician Assistant for more than 15 years.

Dr. Overhulser joined the Oklahoma Allergy & Asthma Clinic in 1991 after completing her Allergy and Immunology fellowship at the University of Texas Health Sciences Center in San Antonio, Texas.

Dr. Hatch has been with the Oklahoma Allergy & Asthma Clinic since 1997.

Dr. Stutes joined the Oklahoma Allergy & Asthma Clinic staff in September of 2010. 

Stefanie Rollins joined the Oklahoma Allergy & Asthma Clinic staff in July of 2012.